Overview
Assurance levels are Prove’s tiered confidence metric, ranging from -1 to 1, that dynamically adapts to user behavior and various authentication keys. It allows for adaptive security policies, meaning you can require different levels of verification for different types of transactions.| AL | Reason | Description |
|---|---|---|
| -1 | -1A | Too many identities bound to a single phone number. |
| -1F | Premium rate number globally or listed on the US Override Services Registry (OSR) registry. | |
| -1G | Online rentable temporary eSIM or VoIP number. High activity increases suspicion rather than reducing it. | |
| -1H | Online rentable temporary eSIM or VoIP numbers, with high activity. Equal to AL-1G but these phone numbers are actively used for fraudulent activities. | |
| 0 | 0B | No behavioral data available. Country doesn’t give it. |
| 0C | Assigned number with no behavioral activity. Dormant accounts carry reuse risk. | |
| 0D | Short tenure, no activity. Number likely not yet in use. Lower fraud risk than dormant assigned numbers. Reclassifies to AL0E if activity appears. | |
| 0E | Short tenure with behavioral activity present. | |
| 0F | Activity volume exceeds normal human thresholds. High volume is a bot signal, not a positive one. | |
| 0G | Pagers or other non-standard line types. Behavioral signals incompatible with standard identity verification. | |
| 1 | 1A | Enough ownership tenure and longitudinal human behavior |
| 1B | Tenure and longitudinal human behavior with Prove binding phone to a specific identity, supersedes AL1A | |
| 1D | Low longitudinal behavior but human signals such as ports, calls, or logins indicate not an eSIM bot |